Figure B–1:
VMS Operating System Requires Unique Unit Numbers for
DSSI Devices
Allocation Class=0
Nonzero Allocation Class
(Example: ALLCLASS=1)
R7CZZC$DIA1
$1$DIA1
$1$DIA2
$1$DIA3
$1$DIA0
$1$DIA1
$1$DIA2
R7ALUC$DIA2
R7EB3C$DIA3
R7IDFC$DIA0
R7IBZC$DIA1
R7IKJC$DIA2
Nonzero allocation class examples with an asterisk indicate duplicate device names.
For one of the DSSI busses, the unit numbers need to be reprogrammed to avoid this error.
*
Duplicate 1
*
Duplicate 2
*
TFDR1$MIA0
$1$MIA0
MLO-006602
NOTE:
Digital recommends that you configure your systems to have unique
unit numbers even if you have a standalone system using an allocation class
of zero. This practice will avoid problems with duplicate device names if you
later decide to form a cluster.
B.3 Examining and Setting DSSI Device Parameters
The following instructions describe how to change DSSI parameters, using
the DUP driver utility. In the example procedures, the allocation class will
be set to 2, the devices will be assigned new unit numbers (to avoid the
problem of duplicate unit numbers), and the system disk will be assigned
a new node name.
1.
Enter the console mode.
The procedure for programming parameters for DSSI devices from
console mode requires that you issue commands to those devices at
the console prompt (>>>). You may enter these commands in either
B–4
VAX 4000 Model 200 (BA430) Operation
